Strip periodic transmission side-to-side winding control method

Abstract

The present application relates to a kind of strip periodic transmission side-to-edge curl control method, including DSS detector, controller, position sensor, servo valve, hydraulic cylinder, the transmission side of coiler is provided with DSS detector, servo valve, hydraulic cylinder, the DSS emitter of DSS detector and position sensor are connected with controller by port, controller is connected with servo valve by port, servo valve is connected with hydraulic cylinder, position sensor is set on the base of coiler, and hydraulic cylinder is used to drive coiler axial movement.The present application has the advantages that when the deviation value reaches the set offset value, the set voltage value is added to the control end of controller, the valve plate opening of servo valve is controlled by controller, and the set voltage value given by controller is followed by hydraulic cylinder to ensure that coiler axial displacement is synchronized, so that coiler can continuously follow the position change of the monitored edge of strip, realize that strip steel is curled edge in transmission side neat, avoid the appearance steel roll tower type.

Description

Technical Field

[0001] This invention relates to the field of strip steel production equipment, and more particularly to a method for controlling the edge curling of strip material during periodic transmission. Background Technology

[0002] Currently, in order to ensure the neatness of the coiled edges of cold-rolled silicon steel production lines in metallurgical enterprises, coiler alignment (EPC) is typically used to track the edge position of the strip. This controls the coiler to align one side of the strip edge during coiling, maintaining the strip's neatness. However, due to inherent characteristics of the sheet metal (such as camber) or external factors (such as wear on guide rollers), the strip may experience axial displacement during its journey. If alignment is not used at the coiling point, the strip will not coil neatly. Such unevenly coiled coils cannot be produced in subsequent processes. After coiling to a certain weight, the coiled coils will loosen due to the core, resulting in a tower-shaped coil. During the coiler alignment process, if the strip edge exhibits waviness or vortex-like edges, it can also lead to uneven stress or slippage at the edge during coiling. As the coil gradually increases in size, the tension on the outer periphery of the coil can squeeze out the inner ring of the core, forming a pagoda or bowl shape, commonly known as a tower shape. This requires frequent rewinding operations by operators to ensure the unit's normal operation, increasing the probability of accidents and production costs. Summary of the Invention

[0003] The purpose of this invention is to provide a method for controlling the edge curling of strip on the periodic drive side, so that the coiler can continuously follow the positional changes of the monitored edge of the strip, thus avoiding the formation of a coil tower shape.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for controlling the edge-to-edge curling of strip on the periodic drive side includes a unit with guide rollers and a winding machine. The unit also includes a DSS detector, a controller, a position sensor, a servo valve, and a hydraulic cylinder. The drive side of the winding machine is equipped with the DSS detector, servo valve, and hydraulic cylinder. The DSS detector includes a DSS transmitter and a DSS receiver. The DSS transmitter and position sensor are connected to the controller via a port. The controller is connected to the servo valve via a port. The servo valve is connected to the hydraulic cylinder. The position sensor is mounted on the base of the winding machine and is used to detect the lateral displacement of the winding machine. The hydraulic cylinder is used to drive the axial movement of the winding machine. The control method specifically includes the following steps:

[0006] S1. The controller obtains the correction value. The deviation value of the strip passing through the DSS detector this time is subtracted from the deviation value of the strip passing through the DSS detector the previous time. The resulting value is the correction value. The formula for the deviation value is as follows:

[0007] Correction value = Baseline value - Target value ①

[0008] In Formula ①, the target value is the portion of the optical signal received by the receiver when it passes through the transmitter and is blocked by the strip steel, and the reference value is the entire optical signal received by the receiver when it passes through the transmitter and is not blocked by the strip steel.

[0009] S2. When the correction value reaches the set offset value, the set voltage value is added to the control terminal of the controller. The controller controls the valve plate opening of the servo valve so that the hydraulic cylinder follows the set voltage value given by the controller to ensure the axial displacement of the winding machine is synchronized.

[0010] In step S2, the set voltage value is obtained by the number of rotations of the winding machine, as detailed below:

[0011] The initial position of the winding machine is the zeroth revolution. For each revolution, a positive voltage setpoint is added to the controller.

[0012] When the winding machine reaches the set number of turns, the positive voltage setting value is reduced for each rotation.

[0013] When the winding machine reaches the set number of revolutions two, the controller is given a zero voltage setting value. After that, for each revolution, the controller is given a decrease in the negative voltage setting value.

[0014] When the winding machine reaches the set number of three revolutions, it increases the negative voltage setting value of the controller for each revolution.

[0015] The winding machine completes one cycle when it reaches the set number of turns (four), at which point the counter is reset.

[0016] The number of rotations of the winding machine is obtained by an encoder located on the drive side of the winding machine.

[0017] The DSS detector is used to detect the position of the strip edge on the guide roller. The DSS detector is a non-contact photoelectric sensor. The DSS transmitter is set on the base of the guide roller, located at the front end of the guide roller and parallel to the guide roller. The DSS receiver is set on a bracket, which is connected to the base of the guide roller. The DSS receiver is located directly above the DSS transmitter.

[0018] The unit surface is provided with grooves, and the DSS transmitter is fixed in the grooves.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] When the correction value reaches the set offset value, the set voltage value is added to the control terminal of the controller. The controller controls the valve plate opening of the servo valve, and the hydraulic cylinder follows the set voltage value given by the controller to ensure that the axial displacement of the coiler is synchronized. This allows the coiler to continuously follow the position change of the monitored edge of the strip, so that the strip is neatly coiled on the drive side, avoiding the formation of a steel coil tower. The modification structure is simple, low in cost, and easy to implement. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the side-to-side curling structure of the strip during periodic transmission.

[0022] Figure 2 This is a schematic diagram of the shape of the rolled edge of the strip steel.

[0023] Figure 3 This is a schematic diagram of the external wiring of the controller.

[0024] In the diagram: 1-Winder 2-Guide roller 3-Controller 4-Detector 5-Servo valve 6-Hydraulic cylinder 7-Position sensor. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0026] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0027]

Example 1

[0028] In cold-rolled silicon steel production lines, strip coiling correction typically employs coiler correction (EPC), i.e., edge-to-edge coiling on the drive side. Due to inherent sheet material characteristics (such as camber) or external factors (such as guide roller wear), or when edge waviness or vortexes appear on the strip, the DSS detector detects a shift in the strip's position. The EPC then controls the coiler to move proportionally in the direction of this shift. If the strip edge has waviness or vortexes, it can cause uneven stress or slippage during coiling. As the coil diameter increases, the tension on the outer periphery can push out the inner coil core. After modification, by adding a position sensor 7, a servo valve 5, and a hydraulic cylinder 6 to the existing equipment, this method of neat edge correction on the drive side is changed, achieving neat edge coiling on the drive side. A method for periodic edge-to-edge coiling control on the drive side of strip is described below. Figure 1The system includes a generator set, a DSS digital detector 4, a web guiding controller 3-H6600, a position sensor 7, a servo valve 5, and a hydraulic cylinder 6. The generator set includes a guide roller 2 and a coiler 1. The drive side of the coiler 1 is equipped with the DSS digital detector 4, servo valve 5, and hydraulic cylinder 6. The web guiding controller 3-H6600 is connected to the servo valve 5 via a port, and the servo valve 5 is connected to the hydraulic cylinder 6. The position sensor 7 is mounted on the base of the coiler 1. The hydraulic cylinder 6 drives the coiler 1 to move axially. The DSS digital detector 4 detects the position of the drive side edge of the strip on the guide roller 2. The strip can move within the detection range of the DSS digital detector 4. The DSS digital detector 4 consists of a transmitter, a wide-angle receiver, and a signal conversion control board. 4. The position change of the strip edge is detected by the DSS digital detector 4, and the position of the strip edge detected by the DSS digital detector 4 is converted into a voltage signal proportional to it by the signal conversion control board and output to the correction controller 3-H6600. The DSS digital detector 4 is a non-contact photoelectric sensor. The DSS transmitter is set on the base of the guide roller 2, located at the front end of the guide roller 2 and parallel to the guide roller 2. A bracket is set on the drive side of the strip roller table, and a wide-angle receiver is set on the bracket. The bracket is connected to the base of the guide roller 2, and the wide-angle receiver is located directly above the DSS transmitter. The position sensor 7 is used to detect the lateral displacement of the coiler and converts the lateral displacement signal of the coiler into a voltage signal proportional to it and outputs it to the control amplifier H6600. A groove is set on the surface of the unit, and the DSS transmitter is fixed in the groove.

[0029] The control method includes the following steps:

[0030] S1. The correction controller 3-H6600 obtains the correction value. The deviation value of the strip when it passes through the DSS digital detector 4 this time is subtracted from the deviation value of the strip when it passed through the DSS digital detector 4 the previous time. The resulting value is the correction value. The formula for the deviation value is as follows:

[0031] Correction value = Baseline value - Target value ①

[0032] In Formula ①, the target value is the portion of the optical signal received by the receiver when it passes through the transmitter and is blocked by the strip steel, and the reference value is the entire optical signal received by the receiver when it passes through the transmitter and is not blocked by the strip steel.

[0033] S2. When the correction value reaches the set offset value, the set voltage value is added to the control terminal of the correction controller 3-H6600. The correction controller 3-H6600 controls the valve plate opening of the servo valve 5, so that the hydraulic cylinder 6 follows the set voltage value given by the correction controller 3-H6600 to ensure the axial displacement of the winding machine 1 is synchronized.

[0034] The set voltage value is obtained by the number of rotations of the winding machine 1. The number of rotations of the winding machine 1 is obtained by an encoder installed on the drive side of the winding machine 1, as detailed below:

[0035] The initial position of the winding machine 1 is the zeroth rotation. For each rotation, a positive voltage setting value is added to the web correction controller 3-H6600.

[0036] When the winding machine 1 reaches the set number of revolutions, the positive voltage setting value of the web correction controller 3-H6600 is reduced for each revolution.

[0037] When the winding machine 1 reaches the set number of revolutions two, the zero voltage setting value is given to the web correction controller 3-H6600. After that, the negative voltage setting value is reduced for each revolution of the web correction controller 3-H6600.

[0038] When the winding machine 1 reaches the set number of revolutions three, it adds a negative voltage setting value to the web correction controller 3-H6600 for each revolution.

[0039] When the winding machine 1 reaches the set number of turns four, it is considered one cycle, at which point the counter is reset.

[0040] Work process:

[0041] The DSS digital detector 4 detects that the strip steel has shifted 5mm towards the drive side at the guide roller 2. The output voltage then increases by 0.5V from zero (the strip steel's position at the guide roller 2 is the zero point during calibration). Since the edge position of each coil of strip steel cannot be guaranteed to be exactly the same when the strip head enters the coiler, a certain tension will be established after the strip head enters the coil and before the coiler starts coiling. Once the tension is successfully established, the production system will send a signal to the web correction controller 3-H6600 of the coiling EPC. At this time, the web correction controller 3-H6600 will define the current position of the strip steel at the DSS detector as the zero point position of the current coil, and set the voltage signal output by the position sensor 7 at the coiler 1 to 0V. The web correction controller 3-H6600 calculates using 0.5V and 0V to determine that a 5mm shift towards the drive side corresponds to a 0.1V increase in signal voltage. Therefore, the web correction controller 3-H6600 outputs the corresponding electrical signal to the servo valve 5. The hydraulic cylinder 6 of the base of the coiler 1 is driven to move 5mm to the transmission side. This reciprocating action is performed to perform PID closed-loop control, so that the coiler can continuously follow the position change of the monitored edge of the strip, thereby obtaining the coiled steel strip with neat edges on the transmission side.

[0042]

Example 2

[0043] In this embodiment, a strip periodic transmission side edge curling control method is the same as in Embodiment 1, but a PLC analog output module is added. The analog output module loads an analog voltage signal to the correction controller 3-H6600, so that the action length of the hydraulic cylinder 6 is linear and proportional.

[0044] See Figure 3 By adding an analog output module 6ES7322-5HF00-0AB0 to the Siemens PLC ET200 station, the DC voltage range of the output module is +10V to ~10V. This voltage is supplied to the bias signal control terminals D8 and D11 of the EPC web correction system web correction controller 3-H6600. The logic of the EPC web correction system web correction controller 3-H6600 driving the hydraulic cylinder 6 after receiving the ±10V signal and the stroke of the hydraulic cylinder are observed. By accumulating the initial diameter of the strip coiling (508mm) and the strip thickness, the strip diameter increases by twice the strip thickness for each rotation of the strip coiler. The number of strip coils can be calculated from the diameter of the coiled strip. The specific details are as follows:

[0045] Current diameter of the steel coil = (Initial coil diameter 508mm + strip thickness * 2) Formula ②

[0046] Number of coil turns = (Current diameter of the steel coil - Initial coil diameter of 508mm) / 2, Formula ③

[0047] The number of rotations of the winding machine is measured by the encoder to define the corresponding DC voltage signal output. The first rotation outputs 0V, and the second rotation outputs 1V.

[0048] Through experiments, it was determined that 40 rotations constitute one conversion cycle. At rotation 0, the analog output module provides a positive voltage increment of 1V to the bias signal control terminal of the web guiding controller 3-H6600 for each rotation. At rotation 10, the analog output module provides a positive voltage decrement of 1V to the bias signal control terminal of the web guiding controller 3-H6600 for each rotation. At rotation 20, the analog output module provides a voltage of 0V to the bias signal control terminal of the web guiding controller 3-H6600, and the winding machine begins to output a negative voltage to the bias signal control terminal of the web guiding controller 3-H6600 for each rotation, decreasing by 1V per rotation. At rotation 30, the voltage begins to increase by 1V per rotation. At rotation 40, one cycle is completed, and the counter is reset. Table 1 is a comparison table of the external applied voltage and the displacement of hydraulic cylinder 6 measured in the experiment.

[0049] Table 1:

[0050]

[0051] See Figure 2The peak voltage is set for every 10 turns of the coiling process. This periodic repetition results in a coiled steel coil with periodic, controllable edge misalignment.

[0052] In this invention, when the correction value reaches the set offset value, a set voltage value is added to the control terminal of the controller. The controller controls the valve plate opening of the servo valve, and the hydraulic cylinder follows the set voltage value given by the controller to ensure that the axial displacement of the coiler is synchronized. This allows the coiler to continuously follow the position change of the monitored edge of the strip, so that the strip steel is neatly coiled on the transmission side, avoiding the formation of a steel coil tower. The modification structure is simple, low in cost, and easy to implement.

Claims

1. A method for controlling the edge-to-edge curling of strip during periodic drive, comprising a unit, wherein the unit is equipped with guide rollers and a winding machine, characterized in that, It also includes a DSS detector, a web guiding controller, a position sensor, a servo valve, and a hydraulic cylinder. The drive side of the winding machine is equipped with a DSS detector, a servo valve, and a hydraulic cylinder. The DSS detector includes a DSS transmitter and a DSS receiver. The DSS transmitter and the position sensor are connected to the web guiding controller via a port. The web guiding controller is connected to the servo valve via a port. The servo valve is connected to the hydraulic cylinder. The position sensor is mounted on the base of the winding machine and is used to detect the lateral displacement of the winding machine. The hydraulic cylinder is used to drive the axial movement of the winding machine. The control method specifically includes the following steps: S1. The correction controller obtains the correction value. The deviation value of the strip when it passes the DSS detector this time is subtracted from the deviation value of the strip when it passed the DSS detector the previous time. The resulting value is the correction value. The formula for the correction value is as follows: Correction value = Baseline value - Target value ① In Formula ①, the target value is the portion of the optical signal received by the receiver when it passes through the transmitter and is blocked by the strip steel, and the reference value is the entire optical signal received by the receiver when it passes through the transmitter and is not blocked by the strip steel. S2. When the correction value reaches the set offset value, the set voltage value is added to the control terminal of the correction controller. The opening of the servo valve is controlled by the correction controller, so that the hydraulic cylinder follows the set voltage value given by the correction controller to ensure the axial displacement of the winding machine is synchronized. Through experiments, it was determined that 40 rotations constitute one conversion cycle. At the 0th rotation, the analog output module outputs a positive voltage that increases by 1V per rotation to the bias signal control terminal of the web guiding controller. At the 10th rotation, the analog output module outputs a positive voltage that decreases by 1V per rotation to the bias signal control terminal of the web guiding controller. At the 20th rotation, the analog output module outputs a voltage of 0V to the bias signal control terminal of the web guiding controller, and the winding machine starts outputting a negative voltage to the bias signal control terminal of the web guiding controller with a decrease of 1V per rotation. At the 30th rotation, the voltage starts increasing by 1V per rotation. The 40th rotation marks one cycle, and the counter is reset.

2. The method for controlling the edge curling of strip on the periodic transmission side according to claim 1, characterized in that, The number of rotations of the winding machine is obtained by an encoder located on the drive side of the winding machine.

3. The method for controlling the edge curling of strip on the periodic transmission side according to claim 1, characterized in that, The DSS detector is used to detect the position of the strip edge on the guide roller. The DSS detector is a non-contact photoelectric sensor. The DSS transmitter is set on the base of the guide roller, located at the front end of the guide roller and parallel to the guide roller. The DSS receiver is set on a bracket, which is connected to the base of the guide roller. The DSS receiver is located directly above the DSS transmitter.

4. The method for controlling the edge curling of strip on the periodic transmission side according to claim 1, characterized in that, The unit surface is provided with grooves, and the DSS transmitter is fixed in the grooves.

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